All of the sudden, grub brings me to it's minimal command interface, and doesn't boot Openmediavault.

Allright. My OMV was being a bit slow, so, I thought, "Let's refresh the system with a reboot.". Then, I couldn't connect to it anymore.
I connected a screen, and found out that grub was not booting OMV. So I decided to do what anyone else would do, run bootrepair disk.
Then it gave me this in the bootmenu of unetbootin:

(initramfs) mount: mounting /dev/loop0 on ///filesystem.squashfs failed: Input/output error Can not mount /dev/loop0 (/cdrom/casper/filesystem.squashfs) on //filesystem.squashfs

(Might not exactly be the error)
So that didn't work. Also manually booting gave me errors, bringing me to initramfs.
More info in the post I made here: http://askubuntu.com/questions…t=1#comment1055855_715376 ,
but thought I might get better answers here, since you are the specialized omv guys.

Thanks for your (possible) help,

-JustRamon